. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 2. Ultra-thin section of avian tubercle bacillus embedded in Araldite. The organism appears smooth and there is a fine cytoplasmic membrane underlying the cell wall. 60,000. Fig. 3. Ultra-thin section of avian tubercle bacillus embedded in Araldite. A spore is developing in the centre of the bacillus and is enclosed in a fine double membrane. 80,000. The so-called vacuole is usually filled with a fine network and the central dense structure has a far more luiiform appearance. Instead of the complex mass of t
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 2. Ultra-thin section of avian tubercle bacillus embedded in Araldite. The organism appears smooth and there is a fine cytoplasmic membrane underlying the cell wall. 60,000. Fig. 3. Ultra-thin section of avian tubercle bacillus embedded in Araldite. A spore is developing in the centre of the bacillus and is enclosed in a fine double membrane. 80,000. The so-called vacuole is usually filled with a fine network and the central dense structure has a far more luiiform appearance. Instead of the complex mass of threads and granules that are observed with methacrylate we find a smooth thread-like structure with associated dense granules. These results with Araldite are only preliminary but seem to us to be promising. Some similar tests have been made with mammalian tissues and there are indications that Araldite will be useful in the preparation of hard tissues, such as adult hairs. We would like to thank Dr. R. II. Cilaucrt. of Aero Research Ltd., for his cooperation throughout the course of this work. Some of the electron micrographs were taken in the Cavendish Laboratory, Cambridge, and we would like to thank Dr. V. E. Cosslett and Mr. R. W. Horne for providing electron microscope facilities. References 1. Brifger, E. M., Cossiftt, V. E., and Glaltrt, A. M., J. Gen. Microbiol. 10, 294 (1954). 2. Brifger, E. M. and Glauert, A. M., /. Gen. Microbiol. 7, 287 (1952). 3. — Naliire, 178, 544 (1956). 4. Chapman, G. B., y. Bacteriol. 71, 348 (1956). 5. Maaloe, O. and BiRf h-Andi rsfn. A., Vlth Symp. Soc. Gen. Microbiol. "Bacterial Anatomy", p. 261. (1956). The Use of Gelatin for Embedding Biological Objects in Preparation of Ultrathin Sections for Electron Microscopy V. P. GiLEV Lab. of Electron Microscopy, Acad, of Sciences of tlie USSR, Moscow 1 HE majority of investigators working in the field of electron microscopic cytology and histology use the method of embedding biologica
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